Suction-box for paper-making machines



G. S. JOHNSON.

SUCTION BOX FOR PAPER MAKINGl MACHINES.

APPLICATION FILED APR. I9, 1920.

SUCTION-BOX FOR, PAPER-ING MACHINES.

speieationof Letters raient.,

Application filed .April 19,

To all whom t may concern.'

Be it known that I, GEORGE S. JOHNSON, a citizen of the United States,residingat Brainerd, in the county of Crow Wing and State of Minnesota,have invented certain new and useful Improvements in Suction- Boxes forPaper-Making Machines; and I do declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame. t

This invention relates to an improved suotion box for use in connectionwith a paper making machineand one object of the invention is to soconstruct the box that the suction through the box may be evenlydistributed and excessive wear -upon the felt prevented at anyparticular point. In suction boxes of the usual construction the suctionabove the exhaust pipe is greater than any other place-in the-box andtherefore the felt at this point will be worn more than at other pointswhereas with this device the objection is overcome.

Another object of the invention is to so construct the suction box thatthe suction may be confined toa space of approximately the width of thepaper and to permit of adjustment according to rthe width of the paper.Y

Another object of the invention is to so construct the box that the topor head thereof may be properly centered in the body portion of the box.

Another object of the invention is to so construct this box that thehead may be formed of a plurality of sections which -will be separatelyplaced in the body of the box and securely held in an assembledposition.

Another vobject of the invention is to so construct this head that itmay be easily built to the desiredfsize, it' simply being necessary toprovide the proper number of intermediate sections according to the sizeof' head desired.7

Another object of the invention is to so construct the box that it maybe easily and quickly taken apart for cleaning or repairs when necessaryand be readily reassembled.

This invention is illustrated in the accompanying drawings wherein:

Patented Apre 19?, 1921. 1920. Serial No. 375,049.

Figure l is a top plan view of the improved suction box.

Fig. 2 1s a longitudinal sectional View through the box taken along theline 2 2 of Flg. l.

Fig. 3 is a longitudinal sectional view through the box taken along theline 3 3 of Fig, 2.

Fig. 4 is a transverse sectional view taken along the line /1-4 of Fig.2.

Fig. 5 is a vi w showing the box in end elevation.

This improved box is provided with a housing having a bottom 10 and sideWalls l1 which have their upper portions cut away from the-inner facesof the walls thus providing a seat for the head indicated in general bythe numeral 12. This head is formed of a plurality of sections'the endones 13 of which carry plates 14 which are engaged by the end sections13 will at all times be used' and the proper number of intermediatesections 18 will be put in place according to the size of head desired.It will thus be seen that the size of the head can be easily variedaccording to thesize of the box. In order'to slidably mount the head,the sections forming the same will be provided with notches 2() thusproviding side grooves in which the strips 21 carried by the side wallsfit. Therefore the head can be moved longitudinally between the sidewalls of the housing and can be properly centered and securely held inthe desired position by means of the screws 15.

'In order to properly distribute the suction through the housing therehas been provided a baiie plate 22 which is positioned in the housing ata point intermediate its height and rests upon the longitudinallysupporting strips 23 and end blocks 24 positioned in the lower portionof the housing. vThis bae plate is providedwith a plurality' of openings25 which are grouped in the end portions of the plate. lt should benoted that the central portion of this plate which will be located abovethe port 2(5 from which extends the exhaust pipe 27 will be unperforatedand therefore the suction will be prevented from bein@r excessive abovethe exhaust port. In this manner the suction will be evenly distributedthroughout the width of the felt which passes' over the suction box andthere will be no danger of .it being worn to a greater extent directlyabove the exhaust port than at any other point. It is also desired tohave the suction coniined to the Width of the aper passing over the boxand in order to o this there has been provided blocks 28 which areslidably mounted in the housing between the baiiie pl te 22 and the head12. These blocks 2 are mounted upon the inner end portions of stems29.which extend through the plates 16 and terminate in handles 30 sothat the stems 29 may be easily grasped and' the stems movedlongitudinally thus changing the positions of the blocks in the housing.

When in use the box is assembled as shown and suction through thehousing will be provided by means of an exhaust fan connected with thepipe 27. The blocks will be moved to the proper points according to thewidth of the paper and as the paper moves over the suction box theproper action will taire place due to the fact that the suctionthroughout the width of the box is of even strength. When it is'desiredto make any necessary repairs, the securing screws 31 which hold theplates 16 in place will be removed and the plates 16 can then be removedfrom the ends of the housin The blocks 28 will be carried outwardly withthese plates and the housing will beleft open thus permitting the bailleplate 22 and the head to be easily and quickly.

removed'. When the proper cleaning or repair has been made the devicewill be reas sembled and the plates 16 then ut back in place andsecured. It will thus e seen that the suction box is so constructed that1t can be easily and quickly taken apart and reassembled and further isso constructed that the suction through the same can be controlled.

What is claimed is: y

l. A suction box comprising a housing open at its upper end,\a headclosing the upper end of the housing and provided with transverselyextending slots converging toward the center of the housing, a suctionpipe entering the bottom of the housing atv approximately the centerthereof, ,a bafiie plate in the housing intermediate its height andhaving its end portions perforated and its central portion above thesuction pipe unperforated, and head blocksv slidably mounted in the endportions of the housing. between the baffle plate and the head of thehousing for closing the openings in the end portions of the plate andhousing. A

2. A suction box comprising a housing having an outlet port in theintermediate portion of its bottom', ahead closing the upper end of thehousing and provided with diagonal slots extending transversely of thehead, a baiile plate in the housing having its end portions perforatedand its central portion unperforated, and means in the end portions ofthe housing between the plate and head for selectively closing theopenings in the end portions of the plate and head.

3. A suction box comprising a housing having a head provided with airinlet slots and having its bottom provided with an air mediate itsheight and having its end portions perforated and its central portionabove the outlet portion unperforated.

4. A suction box comprising a housing having a bottomand 'side walls, ahead for vthe housing provided with air passages and mounted between theside walls for longitudinal sliding movement, plates closing the ends ofthe housing, and adjusting means for the head carried by the plates andengaging the head for imparting longitudinal movement to the head andretaining the -head in a set position.

` 5. A suction box comprising a housing having an outlet port in itslower portion and having a head provided with inlet openings, and aperforated baille plate in the housing between the head and outlet'port,the portion of the bae plate directly above the outlet port beingunperforated.

6. A suction box comprising a housing vhaving side walls, a headpositioned between the s ide walls and provided with air inlet openings,runner strips carried by the side walls of the housing and fitting intogrooves in the head to slidably mount the head, end l plates for thehousing, and vset screws fitted through the end plates and engaging theends of the head to adjust the position of the head and retainthe headin a set posiion.

7. A suction box comprising a housing having its bottom provided with anair outlet port, the head for the housing provided with air inletopenings, a baiie plate in the housing between the head and outlet port,the bathe plate being provided with air passages upon o posite sides ofthe outlet port, blocks for c osing certain of the openings of the headand baffle plate slidably mounted in the end' nmszivY 8. A suction boxcomprising a casing having an air outlet port, and a hed for the housingformed of sections extending transversely and having their side portionsout 5 to provide air inlet slots when the sections are in contactingrelation.

9. A suction box comprising a housing having an outlet port, a headhaving inlet openings, a suction equalizing plate in the housing betweenthe head and outlet port, 10

land means adjustably mounted in the housing between the head and platefor selectively closing certain of the openings `of- GEORGE SHEPHERDJOHNSON.

